Phase 5 Weapon Systems Inc WSI Enhanced Lower Parts Kit Black Phase 5 LPK. Package Contents: Bolt Catch Plunger Bolt Catch Roll Pin Bolt Catch Spring Buffer Retainer Buffer Retainer Spring Disconnector Disconnector Spring Extended Bolt Release v3 (EBRv3) Hammer Hammer Pin Hammer Spring Magazine Catch Magazine Catch Button Magazine Catch Spring Pistol Grip Pistol Grip Lock Washer Pistol Grip Screw Pivot Pin Pivot Pin Detent Pivot Pin Detent Spring Selector Selector Detent Selector Detent Spring Takedown Pin Takedown Pin Detent Takedown Pin Detent Spring Trigger Trigger Guard Roll Pin Trigger Guard Screw Trigger Pin Trigger Spring Winter Trigger Guard (WTG) Phase 5 Weapon Systems Inc Phase 5 LPK: WSI Enhanced Lower Parts Kit Black